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Note 9 - Cash Dividends (Details Textual) - USD ($) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 31, 2018
Payments of Ordinary Dividends, Common Stock | $ 2,564,000 | $ 2,513,000 |
Dividends Accrued | $ 38,463 | $ 19,826 |
Subsequent Event [Member] |  |  |
Quarterly Indicated Per Share Dividend Rate |  |  | $ 0.05
Annual Indicated per Share Dividend Rate |  |  | $ 0.20

X
- Definition The indicated per share dividend rate for a specific fiscal year. + References No definition available. + Details
Name: | lyts_AnnualIndicatedPerShareDividendRate
Namespace Prefix: | lyts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Dividends declared but unpaid on equity securities issued by the entity during the period. + References No definition available. + Details
Name: | lyts_DividendsAccrued
Namespace Prefix: | lyts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The indicated per share quarterly cash dividend rate. + References No definition available. + Details
Name: | lyts_QuarterlyIndicatedPerShareDividendRate
Namespace Prefix: | lyts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |